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Niigata

12V12V28HX

Niigata 28AHX / 28HX (280mm Bore) — Marinediesel, Bohrung 280 x Hub 390 mm, 6L28AHX: 800 rpm; 8L28AHX/9L28AHX/V28AHX: 750 rpm rpm, 6L28AHX: 2220 kW @ 800rpm; 8L28AHX: 2760-2960 kW @ 750rpm; 9L28AHX: 3105 kW @ 750rpm; V28AHX: 4140-6660 kW (Vee-type). Brennstoff: Marine Diesel Oil (ISO 8217 MDO/MGO); Dual-fuel LNG versions available as 28AHX-DF. Status: Production (28AHX modern series since 2010); 28HX predecessor series (introduced 1988, superseded by 28AHX circa 2008). Verifiziert, Datenblatt verlinkt.

4560.0 kW
Power

Engine Specifications

12
Cylinders
280 mm
Bore
390 mm
Stroke
4-stroke
Stroke Type

Components & Design

Component data being added…

Technical Data

Cylinder Pressure (28AHX) 18 MPa (180 bar) maximum
Cylinder Pressure (28HX) 15 MPa (150 bar) approximate
Specific Fuel Consumption (SFOC) 28AHX 421 g/kWh (achieved via Miller cycle + VIVT)
Swept Volume 6-cyl: 144L; 8-cyl: 192L; 9-cyl: 216L
Max Output/Cylinder 28AHX 370 kW @ 800rpm; 345 kW @ 750rpm
Turbocharger Type Exhaust gas turbocharger with 2-stage charge air intercooling
Starter System Compressed air starter
Emissions Compliance 28AHX: IMO Tier II/III (DF variant); 28HX: IMO Tier I
power kw 4560
rpm 720
fuel type HFO/MDO
configuration V

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Common failures & inspection points

Cylinder head gasket leakage and head warping from high peak pressures (18 MPa)

Inspect head gasket for weeping, measure head flatness with straightedge, check cooling jacket pressure tests

Valve seat/guide wear and deposit accumulation due to Miller cycle design with early intake valve closure

Measure valve guide clearances, inspect seat concentricity, check carbon deposits in combustion chamber during head removal

Piston ring breakage and blow-by in high-load service (turbo-assisted 370 kW/cyl engines)

Perform blow-by measurement, inspect ring grooves for cracks, check land condition, perform compression test

Fuel injector coking and spray pattern degradation at 18 MPa injection pressures, especially on engines with prolonged idle/part-load operation

Test injector spray pattern and opening pressure (50 MPa nominal), inspect nozzle tip for carbon/erosion, check spray symmetry

Turbocharger bearing wear and loss of boost pressure, requiring turbo retrofit or replacement after 15,000+ hours

Monitor boost pressure trend, inspect turbo for axial/radial play, check exhaust temperature rise, perform oil analysis for turbo wear metals

Type-general inspection and maintenance points for this equipment category — not model-specific.

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Equipment Model #123841 · ✓ still in production